Georgy Catoire's Op. 12 '4 Pieces' are delicate and introspective works from the late Romantic/early modern period. They are characterized by their refined harmonies and often shimmering textures.
Achieving a seamless legato and controlling the subtle nuances of pedaling are crucial.
4 Pieces (Op.12) is rated Henle level 5 of 9 — late intermediate repertoire, roughly ABRSM grades 6–7. In the RCM system it corresponds to about level 7.
You should be comfortable at Henle level 5 — meaning you can already play level 4–5 pieces cleanly. Learning it one level early is possible as a stretch piece, but more than that usually leads to months of frustration.
4 Pieces (Op.12) is available as free public-domain sheet music on IMSLP — the score is linked directly from this page.